King
  • King
xy+x+y=-13 yz+y+z=-9 xz+x+z=5 Find x,y,z.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
x(y+1) + y = -13 so x = (-13 -y)/(y+1)
anonymous
  • anonymous
substitute that in for x, and the rest is just a simple 2 equations with 2 unknown variable problem
King
  • King
please wait.....lemme try...

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anonymous
  • anonymous
try.
King
  • King
what is -13-y*z+1?
anonymous
  • anonymous
can you be more clear? post your work
King
  • King
wait i got (-13z-13-yz-y)/y+1 +z=5
anonymous
  • anonymous
ok use equation 2 now: y(z+1) + z = -9 so y = (-9-z)/(z+1) plug that in for y
King
  • King
i got z^2+2z=3
anonymous
  • anonymous
ok. that is a quadratic equation. solve it
King
  • King
can z hav 2 values?
anonymous
  • anonymous
yes
King
  • King
then ans is 1,-3
King
  • King
for z
anonymous
  • anonymous
correct
anonymous
  • anonymous
now substitute for z in the other equations
anonymous
  • anonymous
(for simplicity's sake, substitute into the original equations)
King
  • King
ok ,y =-5,3
anonymous
  • anonymous
correct
King
  • King
x=-4,2
anonymous
  • anonymous
there you go. That's it!
King
  • King
thnx....ure awesome!!!!!!!!!!!!!

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